用python正则表达式爬取百度热搜标题在网址httpstopbaiducomboardtab=realtime里面

的步骤如下：

1. 导入需要的模块：

import requests
import re

2. 发送请求，获取网页内容：

url = 'https://top.baidu.com/board?tab=realtime'
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'}
response = requests.get(url, headers=headers)
html = response.text

3. 使用正则表达式匹配网页内容中的热搜标题：

pattern = re.compile('<a.*?class="title".*?>(.*?)</a>', re.S)
titles = pattern.findall(html)

4. 打印结果：

for title in titles:
    print(title)

完整代码如下：

import requests
import re

url = 'https://top.baidu.com/board?tab=realtime'
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'}
response = requests.get(url, headers=headers)
html = response.text

pattern = re.compile('<a.*?class="title".*?>(.*?)</a>', re.S)
titles = pattern.findall(html)

for title in titles:
    print(title)
``